.border-radius (@radius: 3px) {
	-webkit-border-radius: @radius;
	-moz-border-radius: @radius;
	border-radius: @radius;

	-moz-background-clip: padding;
	-webkit-background-clip: padding-box;
	background-clip: padding-box;
}

.opacity (@opacity: 0.5) {
	-webkit-opacity: @opacity;
	-moz-opacity: @opacity;
	opacity: @opacity;
}